mainstay vs anchor

mainstay and anchor both are nouns.

Word	Noun	Adjective	Verb	Adverb
mainstay	Yes	No	No	No
anchor	Yes	No	Yes	No

As nouns, mainstay and anchor are synonyms defined as:

Other synonyms of mainstay include backbone, keystone, linchpin, lynchpin.

mainstay (noun)	anchor (noun)
the forestay that braces the mainmast	a mechanical device that prevents a vessel from moving
a central cohesive source of support and stability	a central cohesive source of support and stability
a prominent supporter	a television reporter who coordinates a broadcast to which several correspondents contribute

mainstay (verb)	anchor (verb)
	secure a vessel with an anchor
	fix firmly and stably